Outdoor smoking not only exposes people to harmful environmental tobacco smoke, but it also produces unsightly cigarette litter. In an attempt to deter outdoor smoking, Southern Illinois University Carbondale enacted a policy to discourage smoking within 7.62 m of campus building entrances. This study was designed to examine compliance with the existing policy, as well as to examine the effects of two antecedent interventions for improving compliance with the policy and decreasing cigarette litter. Four campus locations were selected. The first antecedent intervention involved removing existing cigarette receptacles and replacing them with a receptacle situated 8.23 m from the building entrances. During the second intervention, a sign was placed at the border of smoke-free areas, and smaller signs were posted on the inside of building doors. Baseline observations revealed a consistent number of smokers in violation of the policy. Results showed that during the first intervention, reductions in smoking were observed at three of the four sites. In addition, a higher proportion of cigarette litter was placed inside receptacles at all of the sites, as opposed to being deposited on the ground. No further reductions behavior change noted when the second intervention was implemented, suggesting that the signs were not successful in exerting additional stimulus control over smoking or littering.